Improved Water Chamber for AirSense 11, HumidAir Water Tub for S11 Series, 340ml Upgraded Humidifier Tub Container,Great-Value CPAP Supplies by Medihealer.

Great product even better than the original. Must buy.

It leaks and eventually fails. It can be tricky to put together. That's a pain since you have to do so every night. Not certain what the improvement is.

Works better than the breathing store model..

This is an inexpensive replacement and that;s the only good thing about it.It holds less water than the original, it’s hard to take apart and put together. If you are not careful the water leaks.Spread the extra money and get the original.

It works, and doesn't leak like others reported. But the fit is way to tight. It's a challenge to take it out and put back in.

Two things that would make this water chamber better is if it was hinged like the original and if the silicone seal was not removable because it’s hard to see how it aligns if it comes off at night when you trying to fill it with water.

Unfortunately I didn't read the reviews before purchasing this chamber and I wish that I had. It's tight fit but I could deal with that except it leaks badly. I filled it up hours before bedtime and noticed water all over my night table. I believed that I possibly overfilled it so I removed it from the cpap, drained some water and cleaned up only to find another puddle when I woke up. After reading the reviews I saw that others had the same experience. Returns aren't a hassle with Amazon, but the fact is that the manufacturer continues to sell this product with manufacturing flaws. It's not worth the price and the manufacturer should be ashamed.

This actually works better than the original product. It seems to be a better fit for the machine.